Dr. María Gélvez-Rueda Profile

Dr. María Gélvez-Rueda

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Proceedings Article | 30 May 2022 Presentation

Functional organic cations in low-dimensional hybrid organic-inorganic perovskites: charge transfer processes

Wouter Van Gompel, Melissa Van Landeghem, María Gélvez-Rueda, Ferdinand Grozema, Sabine Van Doorslaer, Etienne Goovaerts, Laurence Lutsen, Dirk Vanderzande

Proceedings Volume PC12149, PC121490Q (2022) https://doi.org/10.1117/12.2622226

KEYWORDS: Perovskite, Solar cells, Lead, Excitons, Polarons, Microwave radiation, Metals, Ions, Interfaces, Absorption spectroscopy

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Hybrid organic-inorganic perovskites (HOIPs) have received a lot of research attention over the past decade, related to the rapid increase in the power conversion efficiency of perovskite solar cells. The materials used for solar cells are mainly three-dimensional (3D) HOIPs, with a general formula of ABX3 with A being a small monovalent organic cation, B a divalent metal ion, and X a halide anion. More recently, the related material class of 2D HOIPs, with a general formula of (A*)2BX4, is receiving increased attention by combining a generally enhanced material stability compared to 3D HOIPs with a much higher degree of compositional flexibility. 2D HOIPs can accommodate bulkier organic cations (A*) with a conjugated organic core. Depending on the relative alignment between the frontier energy levels of the organic core and the inorganic framework, energy/charge transfer between the components of the hybrid is possible. We built in a carbazole derivative as the organic cation into a 2D HOIP. Through electron paramagnetic resonance experiments combined with computational calculations, we show that excitons generated in the inorganic layer undergo charge transfer at the organic−inorganic interface, resulting in a positive polaron delocalized over several carbazole moieties. In another material system, we incorporate an organic charge-transfer complex (CTC) with a pyrene derivative as the donor and TCNQ as the acceptor into the organic layer of a 2D HOIP. Based on time-resolved spectroscopy, we show that holes are transferred to the inorganic layer upon excitation of the CTC while electrons stay localized on TCNQ acceptor molecules.

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